series.aggregate String|Function (default: "max")

The aggregate function to apply for date series.

This function is used when a category (an year, month, etc.) contains two or more points. The function return value is displayed instead of the individual points.

The supported values are:

• "avg" - the average of all values for the date period.
• "count" - the number of values for the date period.
• "max" - the highest value for the date period.
• "min" - the lowest value for the date period.
• "sum" - the sum of all values for the date period. Defaults to 0 if no data points are defined.
• "sumOrNull" - the sum of all values for the date period. Defaults to null if no data points are defined.
• "first" - the first value
• function(values, series, dataItems, category) - user-defined aggregate function. Returns single value or data item.
• object - (compound aggregate)Applicable to "candlestick" and ohlc "series". Specifies the aggregate for each data item field.